CN1708341A - Keyed connection between filter base and filter cartridge - Google Patents

Abstract

A filter assembly employs radially inwardly and outwardly displaced portions (22,24) of a peripheral roll seam (16) on the cartridge (10) as components of a cartridge compatibility matrix. A base (40) defines an axial entrance to a fixed retainer (44) that is complementary to the compatibility matrix of the cartridge roll seam (16). Axial slots (51) accommodate the outwardly displaced portions (24) of the roll seam while inward protrusions (56) correspond to the location and inward displacement of the inwardly displaced portions (22) of the roll seam. Incompatible filter cartridges are prevented from axial reception into the base. The number, configuration and location of inwardly and outwardly displaced portions (22,24) of the roll seam (16) may be varied to provide a variety of unique compatibility matrices.

Description

Key connection structure between filter base and filter cartridge

technical field

The present invention relates generally to fuel filters for use in connection with internal combustion engines, and more particularly to replaceable fuel filter cartridges for removing foreign particles and/or separating water from a fuel supply system of an internal combustion engine.

Background technique

The fuel filter systems to which the present invention relates typically utilize disposable filter cartridges that can be replaced at predetermined filter life cycles. The replaceable filter cartridge is typically secured to a base that forms inlet and outlet connections between the filter cartridge and the fuel supply system. A number of retaining systems are used to secure the filter cartridge to the base and allow removal of the filter cartridge for replacement purposes.

In practice, filter cartridge requirements may vary depending on: the type and configuration of the internal combustion engine; the particular application in which the internal combustion engine is used; the climate in which the internal combustion engine is operated; and/or regional characteristics related to the quality of the fuel supply. Filter cartridges suitable for replacement in a particular filtration system typically vary in capacity, fluid compatibility, and filter media quality.

One of the problems often encountered in ensuring filtration system performance is that associated with filter cartridge replacement. It is necessary that the replacement filter cartridges be consistent with the filtration requirements of the fuel system. Typically filter cartridges have a generally similar external configuration regardless of performance. As a result, replacement filter cartridges may geometrically conform to the seat of a given fuel filtration device without meeting the fuel system's application specifications and thus compromising the integrity of the fuel filtration system. Substituting an incompatible filter cartridge for the operation of an internal combustion engine may have very serious consequences and may unnecessarily increase the cost over a perfectly suitable low cost filter cartridge. In fact, replacement filter cartridges may be so similar in overall configuration that the vehicle owner and/or service technician servicing the internal combustion engine may unknowingly jeopardize the integrity of the filtration system by using a filter cartridge that is completely unsuitable, despite the Unfit filter cartridges are suitable at first glance. Of course, there are also instances where inferior or unsuitable filter cartridges are installed intentionally without the knowledge of the vehicle owner or operator.

In many applications it is desirable to mount the filter cartridge to the base in a specific angular orientation so that warnings, instructions and markings affixed to the filter cartridge can be properly positioned to ensure visibility and maximize the success of the information spread. In other applications, it may be desirable to lock the filter cartridge in place against the base so that the filter cartridge cannot rotate relative to the base.

US Patent No. 5,035,797, assigned to the assignee of the present invention, discloses a fuel filter assembly in which a base is mounted on a vehicle and a disposable filter cartridge is suspended from the base. The cartridge is secured to the base with a threaded collar engaging a protruding rolled seam formation on the periphery of the cartridge housing. The filter cartridge is replaced by loosening the threaded collar and removing the filter cartridge. A key system is known in which the key protrudes through a corresponding slot in the endcap of the cartridge housing in the direction of the shaft. The size and location of the key protruding in the direction of the shaft ensures compatibility by preventing the installation and sealing of incompatible cartridges without the correct groove configuration. The key interlocks with the keyway to mount the filter cartridge to the base in a defined angular relationship.

US Patent No. 5,837,137, assigned to the assignee of the present invention, discloses a similarly configured fuel filter assembly (eg, a filter cartridge secured to a base by a threaded collar). Projections projecting from a receiving surface of the base are received in corresponding recesses in opposing end faces of the filter cartridge to lock the filter cartridge in a defined angular relationship with the base. This protrusion hinders the installation and sealing of incompatible filter cartridges with inconsistent dimple patterns.

A variant to ensure compatibility in a fuel filter arrangement similar to the one described above is disclosed in US Patent No. 5,766,463 assigned to the assignee of the present invention. The disclosed fuel filter cartridge is formed from a pair of housing sections joined along a rolled joint to form a retaining shoulder. The generally cylindrical upper portion of the filter cartridge is received within the base. A plurality of arcuate protrusions project radially from the cylindrical upper portion of the filter cartridge to be received in compatible tracks of the base. The protrusions are disclosed as part of a key code system including the key/slot system described in the 5,035,797 patent. A keying system that relies on a protrusion protruding from the receiving portion of the cartridge housing may cause the keying system to fail by allowing the filter cartridge without the protrusion to be received unhindered in the keying base.

Another cartridge mounting system is disclosed in US Patent No. 6,187,188, assigned to the assignee of the present invention. The rolled interface at the junction of the cartridge housing sections is displaced radially outward to form a plurality of retention tabs. The base includes a fixed stop structure including a retaining lip on which are formed a plurality of axial grooves in communication with the retaining channel portion. The axial slot is positioned and dimensioned to complement the detent protrusion of the filter cartridge. The filter cartridge is secured to the base by axially aligning the protrusions and slots and moving the filter cartridge upward into the receptacle of the base. The filter cartridge is then rotated so that the protrusion snaps into the detent channel portion. The 6,187,188 patent discloses that compatibility of the filter cartridge with the base can be ensured by forming an arcuate slot in the receiving portion of the filter cartridge to accommodate a key projecting axially from the base, as disclosed in the 5,035,797 patent. Alternatively, the receiving portion of the filter cartridge may be provided with radial protrusions, such as disclosed in the '5766463 patent. The track in the base for receiving the protrusion must be L-shaped (with an axial portion and a radial portion) to accommodate rotation of the filter cartridge relative to the base.

Ensuring filter cartridge compatibility is a constant consideration in this technical field. While the methods of ensuring cartridge compatibility described in Patent Nos. 5,035,797, 5,837,137, and 5,766,463 represent a significant improvement over the prior art, further improvements in effectiveness and efficiency are possible. For example, a key protruding from the base that requires an opening on the filter cartridge compromises the sealing integrity of the filtration system. Keying arrangements that limit the fixed angular positional relationship of the filter cartridge to the base are incompatible with filter assemblies that require rotation of the filter cartridge relative to the base. The L-shaped track disclosed in the 6,187,188 patent may not be easy to manufacture, thus adding to the cost of the filter assembly.

There is a growing need in this technical field for filter devices that prevent the installation of incompatible filter cartridges. Ideally, a filter cartridge compatible with such a keying system would likely be used in a filter unit where the cartridge is secured to the base by a collar and the cartridge is rotated to engage a diameter in a stop fixedly extending from the base. Towards protruding protrusions of the filter unit.

Contents of the invention

Briefly stated, the present invention relates to a filter assembly comprising: a replaceable filter cartridge having a crimped filter cartridge housing end cap connected to a second housing portion Peripheral rolled interface. The surrounding rolled interface is used to integrate the peripheral compatibility model with the filter cartridge. The base assembly is used to axially receive the cartridge end cap into the container and to allow the crimped rolled interface into a fixed stop. Rotating the received filter cartridge at an angle relative to the base engages the outwardly displaced portion of the rolled interface into the detent groove portion of the fixed detent. The discontinuous stop lug serves to prevent axial reception of cartridges of models lacking proper peripheral compatibility due to the definition of the crimped-rolled interface.

According to a feature of the invention, each cartridge configuration can be engaged with a special peripheral compatibility pattern having a rolled interface displaced outwardly and inwardly relative to the circle set by the rest of the rolled interface part. The inward and outward displacement of the rolling interface partially changes the radial distance between the peripheral contour of the rolling interface and the central axis of the filter cartridge.

Another feature of the invention is, with respect to a base assembly having a fixed stop in which the stop lug defines an axial path through the profile of the crimp-roll interface, thereby preventing axial Receive non-compatible filter cartridges. The stop lug portion is provided so as to define a gap in the axial path provided for the outwardly displaced portion of the rolled interface. The inner surface contour of the stop flange part has an inner surface protrusion corresponding to the inward displacement section of the rolling interface. The arrangement and placement of the retaining lugs effectively provides a fixed retainer of the base assembly to the filter cartridge having a specific peripheral compatibility pattern.

In the case of having three equally sized outwardly displaced portions arranged equiangularly around the central axis, the cartridge housing may be symmetrical about the central axis. The outwardly displaced portion acts as a detent projection when axially aligned and angularly rotated within a detent slot defined by a detent fixed on the base assembly. Between the stop protrusions, the rolled interface has three equal length sections of full radius of curvature. According to a further feature of the invention, one or more portions of the rolled interface between the stop protrusions may have sections displaced inwardly relative to the rest of the rolled interface. The number, size and arrangement of the rolled joints shifted inwards and outwards when mated to the base can be varied to ensure cartridge/base compatibility and to index received cartridges into Particular rotation.

There is a fixed stopper on the base, and the stop protrusion is axially received through the groove between the stop flange and the filter cartridge, so as to ensure reliable rotation and stop between the base and the base. The inward protrusion on the flange will ensure its compatibility. The inward protrusions from the stop flange part are arranged in accordance with the position and radial dimension of the inward displacement section of the rolling interface. A peripheral compatibility pattern defined by the rolled interface of the compatibility cartridge passes through a complementary pattern defined by the stop lug portion and the inward protrusion of the fixed stop. The roll seam of a non-compliant filter cartridge that lacks proper alignment of the stop protrusions and the inwardly displaced portion of the roll seam cannot be received axially into the seat. In a peripheral compatibility model, the rolled interface has three equiangularly spaced detent protrusions and three equiangularly spaced inwardly displaced segments. Alternatively, one or more of the inwardly displaced segments may be omitted to ensure precise installation positioning relative to the filter cartridge.

Additionally, the filter cartridge may have at least one protrusion outwardly from the filter cartridge housing end cap received in the base receptacle. A ring around the vessel inlet defines compatibility with the axial opening protruding from the cartridge housing end cap. Also, the construction of the rolled interface and the received portion of the cartridge can be combined with multiple levels of keying for cartridge identification, cartridge positioning and quality control purposes.

It is an object of the present invention to provide a new and improved filter cartridge compatibility model.

It is another object of the present invention to provide a new and improved filter cartridge construction which ensures compatibility of cartridge combinations with a fixed cartridge retention system.

Another object of the present invention is to provide a new and improved filter cartridge assembly, which cannot cancel the compatibility protection of replacement filter cartridges by ignoring the compatibility model structure.

Other objects and advantages of the invention will be more apparent from the accompanying drawings and description.

Description of drawings

With reference to the accompanying drawings, those skilled in the art can better understand the present invention and its many objects and advantages:

Fig. 1 is a partial structural vertical section view of a fuel filter filter cartridge of a typical interchangeable model constituting an embodiment of the present invention;

Fig. 2 is a schematic top plan view of the filter cartridge shown in Fig. 1;

Fig. 3 is an enlarged view of the inward displacement section of the filter cartridge rolling interface shown in Fig. 2;

Fig. 4 is an enlarged structural cross-sectional view of the rolling interface on the left side of the filter shown in Fig. 1;

Fig. 5 is a partially enlarged schematic diagram of the stop protrusion formed by the outward deformation of the rolling interface shown in Fig. 2;

Figure 6 is an assembled front view of the first filter base for receiving the filter cartridge shown in Figure 1;

Fig. 7 is a combined side view of the filter base shown in Fig. 6;

Fig. 8 is a combined top view of the filter base shown in Fig. 8;

Figure 9 is a cross-sectional view of the filter base assembly shown in Figure 6 through line 9-9;

Figure 10 is a bottom view of the filter base assembly shown in Figure 6;

Figure 11 is a cross-sectional view of the filter base assembly shown in Figure 6 through line 11-11.

Detailed ways

A filter base compatible filter cartridge of the present invention is shown in Figures 1-5, indicated generally at 10. Figures 6-11 illustrate an embodiment of the base composition of the compatible cartridge of Figures 1-5, generally indicated by numeral 40.

FIG. 1 is a cross-sectional view of a filter cartridge 10 forming a filter cartridge housing end cap 12 connected to a second housing portion 14 by an external rolling joint 16 . FIG. 4 shows an enlarged sectional view on the left side through the rolling joint 16 in FIG. 1 . In FIG. 1 , the left and right parts of the filter cartridge 10 are shown by dotted lines, which are metal sheets forming the corresponding shell parts of the rolling interface. The metal tab extending from the cartridge housing end cap 12 radially extends beyond the metal tab extending from the second housing portion 13 . When rolled together to form the rolled joint as shown in FIG. 4 , the extended radial length of the metal sheet of the end cap 12 is turned under and overlapped with the metal sheet of the second housing portion 14 . Then, by known techniques, the flipped and overlapped metal sheets are rolled to form a rolled joint. Between the rolling joint and the end cover 12 , a space 20 is formed by the U-shaped bend of the end cover 12 toward the inside of the rolling joint. When forming the joint, the space 20 allows access to the inside of the rolling joint 16, the purpose of which will be explained later.

The filter cartridge 10 has all of the usual structure and function and is well known in the art. The end cap 12 is smaller in diameter than the second housing portion 14 . The filter element 18 is supported by the filter cartridge and is tightly surrounded by end caps. The sealing ring 30 is embedded in the central axial opening 32 and passes through the upper top wall of the end cover 12 . The sealing ring 30 is commonly used to seal against the flow conduit 48 of the outer base 40 on the inside. The base assembly (not shown) also has a coaxial conduit extending through an opening 45 defined by an outer flow conduit 48 . The coaxial conduits discharge unfiltered fuel from filter cartridge 10 and recover filtered fuel. Moisture collects in sump 15 at the bottom of cartridge 10 and is removed through the drain. The structure inside the filter cartridge is not considered as the gist of the present invention. For example, the internal structure of the filter cartridges described in US Pat. Nos. 5,302,284, 5,614,091 and 5,766,463 can be smaller in form and function.

FIG. 2 is a top view of the filter cartridge of FIG. 1 . The rolled joint 16 radially surrounds the cartridge 10 and is spaced from the end cap 12 to form an annular space 20 . Rolled interface 16 has three sections displaced radially outward relative to the central axis of the filter cartridge (and the rest of the rolled interface), forming stop protrusions 24 . As shown in the figure, the stop protrusions 24 are arranged equiangularly on the circumference of the rolling joint, and the extension angle and radial displacement are equal. Three rolled interface parts 23 are connected between the stop protrusions 24 . In the illustrated embodiment, each rolled interface portion 23 has a radially inwardly displaced segment 22 . The inwardly displaced segments 22 provide an additional structure to the peripheral cartridge compatibility model. The rolled seam 16 on the exemplary filter cartridge 10 inwardly displaces a segment 22 diametrically opposite each detent protrusion 24 .

Relative to its circular shape, the inward and outward displacement of the rolled interface creates a sinuous structure on the peripheral shoulder. The complex shape described above facilitates positioning at the radial periphery of the filter cartridge 10 . Detailed description will be given below. Compatibility models with a serpentine or wraparound cartridge perimeter present a unique feature for preventing cartridges from receiving mechanisms that do not have a compatibility model. In addition, as shown in FIG. 2 , when measured perpendicular to the cartridge axis A, the inward and outward displacement of the rolling interface 16 relative to the central axis A of the cartridge defines an annular space 20 having various radial dimensions. When the filter cartridge 10 is flange mounted to the base, the shape of the annular space 20 can be used as part of the filter cartridge compatibility model. According to another feature of the invention, the outer contour of the rolled interface 16, which is axially received by a fixed stop structure, can be used as an integral part of the compatibility model of the filter cartridge in the described base embodiment.

FIG. 3 shows an enlarged view of an inwardly displaced segment 22 on the rolled interface 16 . In the embodiment shown, the inward displacement of the rolled interface forms an arc with a radius of curvature of approximately 6.35 cm (2.5") and a center of curvature located outside the rolled interface 16. The inward deformation moves the rolled interface 16 from the normal The radius of curvature 17 (as shown by the dotted line in Figure 3) shifts inward, and the center of the deformation is displaced in the range of 0.05cm (0.02") to 0.127cm (0.05"). The length of the segment shifted inward extends to the edge of the rolling interface Measure, approximately 1.27cm (0.5”).

FIG. 5 is an enlarged view of the portion of the outwardly displaced stop protrusion 24 of the rolled interface 16 shown in FIG. 2 . Displace the rolled joint radially outward relative to the adjacent rolled joint by about 0.20 cm (0.08") or a distance approximately equal to the radial thickness of the rolled joint 16. Each stop protrusion 24 of the described embodiment retains Its maximum outward displacement is approximately 1.27cm (0.5") (approximately the thickness of a rolled joint). Preferably, the rolled seam 16 has a transition 24a at the end of each adjacent stop projection. The rolled interface 16 of the stop protrusion 24 (including its transition 24a) and the inwardly displaced segment 22 leave a sufficient constant radius of curvature with the center of the cartridge axis A.

It should be noted that inward and outward displacement of the rolled interface can change the configuration of the cartridge end cap 12 and second section 14 . As shown in the right side portion of FIG. 1 , the second housing portion 14 is displaced outwardly at 13 adjacent the outwardly displaced portion 24 of the rolled interface 16 . Moreover, the outward displacement of the rolled joint 16 causes the portion 12a of the cylindrical wall of the original end cap 12 to be displaced outward relative to the line 12b parallel to the central axis A in the direction indicated by the arrow C. Due to the axial advancement of the cylindrical wall towards the second housing portion 14 (as shown in FIG. 1 ), outward deformation of the end cap 12 is increased. At the center of the outwardly displaced portion 24 of the rolled interface 16, the outward deformation of the end cap 12 is greatest. Therefore, the end cap 12 is deformed into a non-cylindrical structure, and the slope of the cylinder wall is centered on each outward displacement of the rolling interface 16 and gradually changes outward. In said present embodiment 10, three outward deformations 12a as described above are provided.

Shown in FIGS. 6-11 is a base of an embodiment of a base assembly 40 for receiving the filter cartridge 10 shown in FIGS. 1-5. The assembly 40 may be a casting having an integrally extending bracket portion 42 . The bracket part 42 is used to receive a reinforced metal tube (not shown in the figure), and an auxiliary screw (attachment bolt) reaches the support structure through the metal tube to fix the filter cartridge. Next to the cradle portion 42 , the base assembly 40 has a cylindrical container wall 46 defining a container 47 for axially receiving the cartridge end cap 12 . The axial center conduit 48 of the base structure 40 is received and sealingly engaged by the grommet 30 of the mounted filter cartridge 10 . The container wall 46 is radially outwardly open so as to define a fixed integral stop 44 . The stopper 44 has three axial grooves 51 complementary to the radially protruding stop projections 24 on the filter cartridge 10 . The axial groove 51 is connected to the stop groove portion 43 defined by the upper portion of the stop flange portion 40 . The upper surface of each stop lug 70 has a ramp 52 and a seat 54 .

The end cap 12 of the rolled interface 16 of the filter cartridge 10 is axially received into the container 47 and the fixed stop 44 until the stop protrusion 24 is aligned with the stop groove 43 . The filter cartridge 10 is then rotated clockwise relative to the base. During rotation, the stop protrusion is lifted along the ramp 52 to a seat 54 defined by the upper surface of the stop lug. The resilient radial extension 34 of the cartridge ring 30 biases the filter cartridge 10 from the base assembly 40 such that the seated stop protrusion 24 prevents inadvertent counterclockwise rotation of the filter cartridge 10 relative to the seat. Each stop groove portion 43 ends at an axially extending stop 72 (as shown in FIGS. 9-11 ).

According to a characteristic of the invention, the inner surface of the stop lug portion 70 has a radially inwardly projecting protrusion 56 corresponding to the position of each inwardly displaced segment 22 . Axial slots are defined between the stop flange portions 70 at positions corresponding to the stop protrusions 24 , and the protrusions 56 are annularly spaced by the axial slots 51 . The axial groove 51 and the flange portion 70 with the protrusion 56 provide the base combination 40 of the filter cartridge, such as the filter cartridge 10 with a compatibilizing structure of the stop protrusion 24 and the inwardly displaced section 22 of the rolled interface . The rolled interface 16 of the compatible filter cartridge is received axially into the opening defined by the stop flange portion 70 , allowing the end cap 12 to be fully received into the container 47 . Then turn the filter cartridge at an angle and load the filter cartridge onto the base. A non-compliant filter cartridge (eg, lacking the requisite inwardly displaced section 22) will be prevented from being received axially and cannot be installed on the seat 40 provided.

Additional features of the invention pertain to the cartridge compatibility model having the detent projection 24 and inwardly displaced segment 22 of the rolled interface as described above, and having the radial protrusion 28 of the cartridge housing end cap 12 . A shoulder 49 protrudes radially inwardly of the central head and fixed stop 44 . In the embodiment of the filter base assembly 40 described, a ring (not shown) is keyed to the shoulder 49 to define the access to the container 47 . The ring has radial projections 28 allowing the axial passage of the end cap 12 . When the radial protrusion 28 passes the ring, the receptacle 47 of the base assembly 40 will allow the filter cartridge to rotate relative to the base. The radial protrusions 28 of the end cap 12 may serve as an auxiliary structure for the cartridge compatibility model. The radial projections can also be used to ensure precise mounting and positioning of the filter cartridge 10 relative to the base assembly 40 .

Claims (24)

1. A filter device comprising: filter cartridge (10), comprising: a filter member (18) extending between the axially divided first and second ends; A housing end cap (12) having a first diameter defining a cylindrical space and supporting a first end of a filter member (18), said housing end cap (12) first end defining an axial opening (32), a generally cylindrical sidewall extending from a first end to a second end, the second end comprising a U-shaped bend; and The second housing part (14) defines a cylindrical space, and the second housing part (14) joins the first end with the second end of the housing end cap through a rolling interface (16), and the second The second end of the housing portion (14) surrounds the second end of the filter member (18), Wherein, the rolling interface (16) has a circular configuration at a first radial distance from the central axis (A); the portion of the interface defining a plurality of stop protrusions (24); and at least one segment of the rolled interface displaced inwardly to a third radial distance relative to said first radial distance (72); A base (40) for mounting a filter cartridge through which fluid flow delivered to and recovered from the filter cartridge is filtered, the base having: A container wall (46) defines a generally cylindrical container (47), said container wall ends radially outwardly expanding to define an integrally extending stop (44) having: outer ring; a plurality of stop lugs (70) projecting inwardly from said outer ring, each said stop lug being angularly spaced from an adjacent stop lug, thereby defining a plurality of axial grooves (51), each of said stop lugs having a radially inward surface profile at a radial distance from the central axis, at least one of said inward surface profiles being radially inwardly The protruding protrusions (56) separate, Wherein, the axial groove (51) is complementary to the position and the second radial distance of the stop protrusion (24), and the inward surface profile is compatible with the first annular portion of the rolling interface (16). complementary radial distance, said inwardly protruding protrusion (56) is complementary to the position of said at least one inwardly displaced segment and a third radial distance (22), whereby said rolled interface (16) Axially pass through the stop lug portion (70) without interference, and then, by rotation of the cartridge (10) relative to the base (40), each of the stop projections (24) snap into their A stop groove portion (43) is axially formed above each of the stop flange portions (70). 2. The filter device according to claim 1, wherein said filter cartridge (10) has three equiangularly spaced stop protrusions (24), and said base has three stop lugs (70 ). 3. The filter device according to claim 1, wherein said filter cartridge (10) has three equiangularly spaced stop protrusions (24), said at least one inwardly displaced segment has three inwardly The displaced segments (22), each inwardly displaced segment is diametrically opposed to a stop protrusion, and the base (40) has three stop lug portions (70), each stop lug The inner surface profile of the portion has inwardly projecting protrusions (56) corresponding to the location of one inwardly displaced segment (22) and the third radial distance. 4. Filter device according to claim 1, wherein said end cap (12) has a radial protrusion (28) and said base (40) has an axial inlet defining an entry into said container (47) A ring defines an axial opening allowing the radial projection of the end cap to pass axially therethrough. 5. The filter device of claim 1, wherein each said stop lug portion (70) has an upper surface defining a ramp (52) and an angled adjacent seat (54). 6. A filter device as claimed in claim 5, wherein the filter cartridge (10) has a resilient member (30) which biases the filter cartridge against the base (40) thereby biasing the detent protrusion (24) in the seat (54). 7. The filter device according to claim 1, wherein each said stop groove portion (43) communicates with its respective axial groove (51), and is separated from the adjacent axial groove, which is defined by said The inwardly protruding stops (72) of the outer ring are not connected. 8. A base (40) for mounting a filter cartridge (10), said base having: a head portion defining a fluid channel for delivering filtered fluid to a filter cartridge housed in the base and for recovery, a container wall (46), projecting axially overall from said head, thereby defining a generally cylindrical container (47), said container wall (46) opening radially outwardly at its axial tail end, thereby defining a fixed A stopper (44) having: Outer ring: A plurality of angularly spaced stop lug portions (70) projecting radially inwardly from the outer ring, thereby defining a plurality of axial slots (51), each of said stop lug portions having a first radius of curvature Arched inward surface profile, The inwardly facing surface profile of at least one of said stop lugs has an inwardly projecting (56). 9. A base as claimed in claim 8, wherein said inward protrusion (56) is diametrically opposed to one of said axial grooves (51). 10. The base of claim 8, wherein said plurality of detent lugs (70) has three angularly spaced detent lugs defining three axial slots (51). 11. The base of claim 8, wherein each of said stop lugs (70) has an upper surface defining a ramp (52) and an angularly adjacent seat (54) to said stop lug (54). The axial distance of the head is larger than the adjacent part of the slope. 12. The base of claim 10, wherein the inwardly facing surface contour of each stop lug (70) has an inwardly projecting (56). 13. The base according to claim 8, having a radially inwardly protruding annular shoulder (49) axially mediating said stopper (44) and said container (47), each of said stopper protrusions a rim (70) having an upper surface defining a bevel (52) and an angularly adjacent seat (54), said seat being axially farther from said head than a portion adjacent said bevel, Wherein, a stop groove portion (43) is defined between the annular shoulder portion (49) and an upper surface of each of the stop flange portions. 14. The base according to claim 13, wherein each said stop groove portion (43) is connected with an axial groove (51) adjacent to said slope (52). 15. The base according to claim 13, wherein each of the stop grooves (43) is connected to an axial groove (51) adjacent to the inclined surface (52), and each stop groove is connected to an axial groove (51) adjacent to the seat The axial slots of (54) are separated by stops (72) projecting radially inwardly from the ring. 16. The base according to claim 8, having a radially inwardly protruding annular shoulder (49), axially mediating said stopper (44) and said container (47), and having a circular inner diameter and fixing A ring at said annular shoulder thereby defining the inlet of said container (47), said ring having at least one axial opening interrupting the inner diameter of said circle. 17. A base (40) for mounting a filter cartridge (10), said base having: The head defines the path of fluid flow in the base, the fluid flows into the filter cartridge to be filtered and flows out from it to complete the filtration, A container wall (46) projecting axially integrally from said head thereby defining a generally cylindrical container (47), said container wall opening axially outwards at its axial tail end thereby defining a fixed stop (44), the stopper has: outer ring; a plurality of first stop means (70) projecting radially inwardly from said outer ring, said first stop means being angularly spaced from each other to define axial slots (51); at least one second stop means (56) projecting radially inwardly from said first stop means, Wherein said outer ring, first and second stop means define an axial inlet of said stopper. 18. Susceptor according to claim 17, wherein said at least one second stop means (56) is diametrically opposed to one of said axial slots (51). 19. The base of claim 17, wherein said plurality of first detent means (70) has three first detent means, angularly spaced to define three axial slots (51). 20. The base of claim 17, wherein each of said first stop means (70) has an upper surface defining a ramp (52) and an angularly adjacent seat (54) to said seat (54). The axial distance of the head portion is larger than the portion of the adjacent slope. 21. The base according to claim 17, having a radially inwardly protruding annular shoulder (49) axially mediating said stopper (44) and said container (47), each of said first stoppers The actuator (70) has an upper surface defining a ramp (52) and an angularly adjacent seat (54), said seat having an axial distance from said head greater than an adjacent portion of said ramp, Wherein, the stop groove portion (43) is defined between the annular shoulder portion (49) and each of the first stop devices (70). 22. The base according to claim 21, wherein each said stop groove portion (43) is connected with an axial groove (51) adjacent to said inclined surface (52). 23. The base according to claim 13, wherein each of the stop grooves (43) is connected to an axial groove (51) adjacent to the slope (52), and each stop groove is connected to an axial groove (51) adjacent to the seat The axial slots of (54) are angularly separated by stops (72) projecting radially inwardly from the ring. 24. The base of claim 8, having a radially inwardly projecting annular shoulder (49) axially mediating said stopper (44) and said container (47), and having a circular inner diameter, and A ring secured to said annular shoulder thereby defining the inlet of said container (47), said ring having at least one axial opening interrupting the inner diameter of said circle.

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